US3645121A - Method for rolling tubular material stock in a stretch reducing mill - Google Patents

Method for rolling tubular material stock in a stretch reducing mill Download PDF

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Publication number
US3645121A
US3645121A US838384A US3645121DA US3645121A US 3645121 A US3645121 A US 3645121A US 838384 A US838384 A US 838384A US 3645121D A US3645121D A US 3645121DA US 3645121 A US3645121 A US 3645121A
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US
United States
Prior art keywords
tubular material
stand
stands
section
rolling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US838384A
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English (en)
Inventor
Gerd Pfeiffer
Horst Biller
Claus Schrey
Alfred Schmitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
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Mannesmannroehren Werke AG
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills

Definitions

  • ABSTRACT I A method for rolling down tubular material in a rolling mill
  • Foreign Application priority Dam herein in the vicinity of the starting sections and/or end sections of the tubular material normally having thickened pory 5, 1968 Germany 17 52 713-8 tions a stepwise variation of therotational speeds is provided at the roll stands deforming these sections, said stepwise varia- [52] US. Cl ..72/205, 72/208, 72/367, i f Said rotational Speeds required f li the central 72/234 section of the tubular material.
  • PATENTEUFEBZS x912 SHEET 8 OF 6 B Be at RI NQ MBIEE H lmrenfars- GM P M1 1 now Filer cm hr 4H1- Ffrcd Ssh $4).
  • a STRETCH REDUCING MILL Tubular material is reduced in its diameter in a rolling mill without an internal die in a plurality of consecutive stand locations.
  • a change in the wall thickness is also effected, the rate of which depends on the stress condition existing in the rolled product.
  • the stress condition in the rolled product which can be defined by the related longitudinal tension (K L the longitudinal force acting on the tubular cross section,
  • k the mean tensile strength of the material of the rolled product
  • a tension rise as per definition is present in a stand in the event that the longitudinal tension between the stand location m+l and the stand location m is greater than the longitudinal tension between the stand location in and the stand location m-l.
  • a tension fall is present in a stand location k in the event that the longitudinal tension between the stand location k+l and the stand location k is smaller than the longitudinal tension between the stand location k and the stand location k-l.
  • the longitudinal tension thus is decreased, whereas at the rearward section of the tubular material entering the first stand locations the longitudinal tension is increased. It follows therefrom that the forward section and the rearward section of the tubular material to be reduced are subjected to a lower longitudinal tension than required for the desired wall thickness variation.
  • the predetermined rating of the longitudinal tension and thus the desired wall thickness variation is achieved in the central portion of the tubular material only.
  • the front end and the rear end of the tubular material are thickened tubular pieces and are cut off as waste, a necessary result of the method.
  • a further object of the invention is to also substantially shorten the thickened rear section of the tubular material at least as compared with the thickened rear section of the tubular material obtained by the prior art methods.
  • a stepwise variation of the rotational speeds is provided for rolling down tubular material in a rolling mill in the vicinity of the front sections and/or rear sections of the tubular material normally having thickened portions at the stands deforming these sections, said stepwise variation of the rotational speeds being greater than the stepwise variation of the rotational speeds required for rolling the central section of the tubular material.
  • This method is conveniently provided such that as far as the front section of the tubular material is concerned, the rotational speeds of the rolls at a plurality of stand locations 1 through m are decreased prior to the entry of the front section of the tubular material relative to the rotational speed sequence when the rolling mill is filled, the percentage in the rotational speed decrease being greatest at the first stand location and decreasing with the increasing number of the stand location, and that then when the front section of the tubular material enters the reducing rolling mill the decreased rotational speeds of the individual stand locations are increased again dependent on the passing of the front section of the tubular material through a plurality of stand locations to the speed sequence with filled rolling material.
  • the increase of the decreased rotational speeds can be effected in increments or continuously at the stand locations which the front section has passed.
  • This invention furthermore contemplates that the percentage in the increase of the rotational speeds to the rotational speeds with filled rolling mill is effected uniformly at all stand locations through which the front section of the tubular material passes.
  • the rotational speeds of the stands through which the front section of the tubular material passes can be respectively increased in such a manner that they receive the same percentage in the rotational speed decrease as the ultimate stand location rolling the front end of the tubular material.
  • the speed differentials of the stand locations effective as tension diminishing upon entry of the front section of the tubular material are greater by the rotational speed decrease than later upon rolling the central section of the tubular material where the stand locations are effective as stand locations maintaining the tension constant, the thickened front section of the tubular material can be greatly shortened.
  • the speed differentials can even be selected sufficiently large so that there is no point on the pressed surface of the caliber having the same speed as the tubular material. In this case the roll slides in all contacting points on the tubular material due to its higher circumferential speed of the caliber relative to the tubular material.
  • FIG. 1 is adiagrammatic illustration of a rolling mill with the tubular material entering, said rolling mill being operated according to conventional practice, the longitudinal tension occuring in the tubular material being indicated;
  • FIG. 2 an illustration similar to FIG. 1 of the rolling mill illustrated there with the tubular material having passed further into the rolling mill;
  • FIG. 3 an illustration of the rotational speed decrease and rotational speed increase at the individual stand locations or a rolling mill operating according to the method of this invention.
  • FIG. 4 is a diagrammatic illustration of a rolling mill operated in accordance with the conventional method in the filled state with the longitudinal tension existing in the tubular material;
  • FIG. 5 is a diagrammatic illustration of the rolling mill illustrated in FIG. 4 with outcoming tubular material, the longitudinal tension existing in the tubular material being illustrated;
  • FIG. 6 is an illustration of the speed reduction and speed increase in the individual stand locations of a rolling mill in accordance with the method of this invention
  • FIG. 7 is an illustration of the speed reduction in the individual stand locations of a rolling mill in accordance with a variant of the method of this invention.
  • the tension increase is effected in the stand locations 1 and 2
  • the tension decrease is effected in the stand locations 5 and 6 for the rotational speed sequence set.
  • the longitudinal tension is constant between the stand locations 2 and 3 on the one side and the stand locations 3 and 4 on the other side.
  • the stand location 3 located in the central tubular section thus is a stand location maintaining the tension constant.
  • the tension decrease has shifted with the advancing of the front section of the tubular material from the stand locations 5, 6 via the stand locations 6, 7 to the stand locations 7, 8.
  • the stand locations 5, 6 have turned into stand locations maintaining the tension constant with unaltered rotational speeds.
  • the wall thickness of the front section of the tubular material is thicker than the wall thickness of the central section of the tubular material.
  • the length of the thickened front section of the tubular material depends on the number of the stand locations which are required for the stepwise tension decrease. In FIGS. 1 and 2 the length of the front section is at least equal to the spacing of two adjacent stand locations.
  • the rotational speeds of the individual stand locations are decreased prior to the entry of the tubular material, as is illustrated in FIG. 3.
  • stand locations are illustrated.
  • the percentage in the rotational speed decrease from the entry of the tubular material relative to the rotational speed with a filled rolling mill amounts to 5 percent between the individual stand locations, so that rotational speed decrease of the stand location 1 is 50 percent, that of stand location 2 is 45 percent etc., and finally that of stand location 11 is percent.
  • the increments in the decrease and the number m of the stand locations with decreased speed is dependent on the minimum and maximum rating of the longitudinal tension required for shortening the thickened front section of the tubular material and of the control range of the motors of the stand locations, in particular of the first stand location, i.e., the stand location number must be selected such that for a predetermined stepwise variation of the speed decrease the speed decrease of the first stand location is within the control range of the coupled motor or engine.
  • the stepwise variation of the rotational speeds between the adjacent stands it must be observed that it is not selected at too large a value because otherwise a tearing off of the tubular material is effected.
  • phase I the front section extends across the stand locations 1 to with the speed reduction in increments of respectively 5 percent from 50 percent at stand location I to 30 percent at the stand location 5.
  • phase II the front section of the tubular material has passed stand location 1.
  • the speed reduction of stand location 1 has been raised to the speed reduction of stand location 2.
  • phase III the front section of the tubular material has passed through stand location 2, the speed reduction of which is increased together with the speed reduction of stand location 1 to the speed reduction of stand location 3, namely to 40 percent.
  • the front section of the tubular material further advancing the speed reductions are increased in an according manner in phases IV to X, so that finally in phase XI all stand locations have been increased to the speeds of the filled rolling mill.
  • the problem is solved in that with the rolling mill filled, the roll speed of all stands 2 in number) participating in the deformation of the tubular material are reduced relative to the speed sequence used for rolling the central section of the tubular material, the percentage in the speed reduction at all stands being equal; thereafter when the rear section of the tubular material enters the sequence of stands 1 through n of the rolling mill the reduced speeds of the stands 2 through 7 are increased dependent on the passing of the rear section of the tubular material through the stands 1 through n in such a manner that the percentage in the speed reduction in the vicinity of the rear section of the tubular material decreases with an increasing number of stand locations to the stand n, and that the central section of the tubular material is rolled in stands the percentage of speed reduction of which is equal.
  • Stands 1 thus maintains the overall reduction; stand 2 is increased only once in the speed; stand 3 is increased in' the speed twice etc., up to the stands n through p which are increased n minus once and thereby reach the initial speeds again.
  • the decrease and increase of the speeds can be effected continuously or in increments.
  • the number n of the sequence of stands in which the rolling speeds are reduced can be determined on the basis of tests.
  • a feature of the invention contemplates that the percentage increase of the rotational speeds of the stands which roll the central section of the tubular material is effected uniformly. This invention furthermore contemplates that the rotational speeds at the stand locations 1 through n are maintained after the rear section of the tubular material has left the rolling mill for the initially described method for shortening the thickened front section of the tubular material.
  • the speed differentials of the stand locations operating tension increasing upon entry of the rear section of the tubular material are greater by the speed reduction than when rolling the central portion of the tubular material when the stand Iocations are operating as stand locations maintaining the tension constant, the thickened rear section of the tubular materiaI can be greatly shortened.
  • the rotational speed differentials can even be selected sufficiently large so that there is no point on the pressed surface of the caliber which has the same speed. In this case the roll slips in all contacting points on the tubular material as a result of its circumferential speed lower relative to the tubular material.
  • the tension buildup is effected in stand locations 1 and 2
  • the tension decrease is effected in stand locations 7 and 8 for the preset rotational speed sequence.
  • the longitudinal tension is constant between stand locations 5 and 6 on the one side and stand locations 6 and 7 on the other side.
  • Stand location 6 disposed in the central section of the tubular material thus is a stand location maintaining constant tension.
  • the tension buildup has varied with the tubular material leaving the mill as compared to the condition with the mill filled, so that not the stand locations 1 and 2, but the stand locations 3 and 4 are stand locations building up tension.
  • the wall thickness of the rear section of the tubular material will be thicker than the wall thickness of the central section of the tubular material.
  • the length of the thickened rear section of the tubular material depends on the number of stand locations which is required for the incremental tension built up. In FIG. 4 and 5 the length of the rear section is at least equal to the spacing of two adjacent stand locations.
  • amount of the reduction depends on the minimum and maximum rating of the longitudinal tension required for the shortening of the thickened rear section of the tubular material, of the diameter reduction sequence employed (increments of the diameter reduction from one stand to the other), and of the control range of the motors or engines of the stand locations.
  • thepercentage rotational speed reduction has been selected with 50 percent for all 24 stands prior to entry of the rear section of the tubular material into the rolling mill.
  • the rotational speeds are increased by 5 percent from stand .2 to 24, i.e., a tubular section results between stand 1 and 2 which is subjected to an increased longitudinal tension of the differential of the rotational speeds of 50 percent minus 45 percent, or 5 percent.
  • the exact time the rotational speed is increased is determined by the length of the rear section of the tubular material which has not yet entered the rolling mill, which will normally be 1 to 5 stand spacings, in considering the time required for balancing the speed increase. In the drawing this length is 3 stand spacings.
  • the rotational speeds are increased by 5 percent from stand 3 to stand 24, again the time required for balancing the speed increase having to be considered so that the speed reduction amounts to 40 percent for these stands, whereas it amounts to 45 percent for the second stand and 50 percent for the first stand.
  • the rear section of the tubular material on which an increased longitudinal tension is exerted is characterized as a beam drawn in full lines.
  • the longitudinal section subject to an increased longitudinal tension extends from stand 1 to 2, the stands 2 to 24 having a speed reduction of 45 percent and stand 1 having a speed reduction of 50 percent.
  • stand 1 is reduced in its speed by 50 percent, stand 2 by 45 percent and stands 3 to 24 by 40 percent.
  • FIG. 6 discloses that after the rear section of the tubular material has left the rolling mill the speed reductions still present at the stand locations I to 11 according to phase XIII are identical to phase I according to FIG. 3 which illustrates the speed reduction in the individual stand locations of a rolling mill for shortening the thickened front section of the tubular material. It will be noted therefrom that the method of this invention permits the performing of the method for shortening the thickened front section of the tubular material for the following tube or pipe without any particular preparation.
  • the problem is solved in that upon entry of the rear section of the tubular material in consecutive stands 1 through q the associated roll speeds thereof are reduced dependent on the passing of the rear section of the tubular material through these stands such that in the vicinity of the rear section of the tubular material the percentage in the speed reduction decreases with increasing stand location number, and that the central section of the tubular material is rolled in stands with unaltered rotational speed.
  • the reduction of the rotational speeds can be effected continuously or in increments.
  • the rotational speeds of the stands which just roll the rear section of the tubular material are at the same time reduced.
  • the number q of the consecutive stands in which the roll rotational speeds are reduced can be determined on the basis of tests.
  • This invention furthermore contemplates that the percentage in the rotational speed reduction of the stand group respectively rolling the rear section of the tubular material is effected uniformly.
  • the amount of the reduction depends on the minimum and maximum rating of the longitudinal tension required for shortening the thickened rear section of the tubular material, on the diameter reduction sequence employed (increments of the diameter reduction from one stand to the other), and on the control range of the engines or motors of the stand locations.
  • FIG. 7 nine stand locations have been illustrated of a rolling mill.
  • the associated speed is reduced by 5 percent in stand 1 upon entry of the rear section of the tubular material, the speed relationship for the speed of the stands I and 2 thereby being varied such thatthe longitudinal tension existing in the tube or pipe is increased in (phase I J.
  • the exact point at which the rotational speed is reduced is determined by the length of the rear section of the tube or pipe which has not yet entered the rolling mill, which is normally between one and live stand spacings, in considering the time required for balancing the speed reduction; in the drawing this length is two stand spacings.
  • the rear section of the tubular material on which an increased longitudinal tension is exerted is characterized respectively as a beam drawn in full lines in the individual phases.
  • the cited percentages have been selected merely for a better understanding in the instant magnitude.
  • the ratings suitable for performing the invention can be determined such that they are first precalculated by means of the practice decisive for the amount of the speed reduction, such as longitudinal tension required, diameter, reduction sequence, control range of the motors and engines, which are then checked by test rolling and are corrected. After the tube or pipe leaves the stands of the rolling mill, the rotational speeds for the stands which have been subjected to a speed reduction are returned to those ratings for which they were set prior to the speed reduction for rolling the central section of the tubular material.
  • a method of rolling down tubular material in a rolling mill in which the rolls of consecutive stands normally operate gradually increasing rotational speed which comprises:
  • a method of rolling down tubular material in a rolling mill in which the rolls of consecutive stands normally operate with gradually increasing rotational speed, wherein upon entry of the rear section of the tubular material in consecutive stands 1 through q the associated roll rotational speeds thereof are reduced dependent on the passing of the rear section of the tubular material through these stands such that in the vicinity of the rear section of the tubular material the percentage rotational speed reduction decreases with an increasing stand location number and wherein the central section of the tubular material is rolled in stands with unaltered rotational speeds.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US838384A 1968-07-05 1969-07-01 Method for rolling tubular material stock in a stretch reducing mill Expired - Lifetime US3645121A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1752713A DE1752713C2 (de) 1968-07-05 1968-07-05 Verfahren zum Auswalzen von Rohren in einem Streckreduzierwalzwerk
DE1927880A DE1927880C2 (de) 1968-07-05 1969-05-31 Verfahren zum Auswalzen von Rohren auf einem Streckreduzierwalzwerk
DE1927879A DE1927879C2 (de) 1968-07-05 1969-05-31 Verfahren zum Auswalzen von Rohren auf einem Streckreduzierwalzwerk

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US3645121A true US3645121A (en) 1972-02-29

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US838384A Expired - Lifetime US3645121A (en) 1968-07-05 1969-07-01 Method for rolling tubular material stock in a stretch reducing mill

Country Status (5)

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US (1) US3645121A (xx)
DE (3) DE1752713C2 (xx)
FR (1) FR2012393B1 (xx)
GB (1) GB1278630A (xx)
SE (1) SE375024B (xx)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874211A (en) * 1973-03-02 1975-04-01 Sumitomo Metal Ind Method of controlling the wall thickness within a tube elongater by utilizing a screw down control
US3919872A (en) * 1973-09-24 1975-11-18 Kocks Gmbh Friedrich Methods and apparatus for tube rolling
US4002048A (en) * 1975-12-19 1977-01-11 Aetna-Standard Engineering Company Method of stretch reducing of tubular stock
US4003229A (en) * 1972-09-06 1977-01-18 Nippon Steel Corporation Method for compensating tail end
US4020667A (en) * 1974-10-23 1977-05-03 Firma Friedrich Kocks Tube rolling
US4033164A (en) * 1974-08-29 1977-07-05 Mannesmannrohren-Werke Ag Method for rolling tubes
US4306440A (en) * 1979-03-03 1981-12-22 Friedrich Kocks Gmbh & Co. Methods and apparatus for rolling bars, rods and wire
US4430875A (en) * 1980-07-25 1984-02-14 Kocks Technik Gmbh & Co. Rolling mill for the stretch-reducing of tubes
US4567630A (en) * 1981-03-10 1986-02-04 Babcock-Hitachi Kabushiki Kaisha Process of continuously producing plate-shaped catalyst and system therefor
US4599883A (en) * 1985-07-05 1986-07-15 Wean United, Inc. Tandem rolling mill
US20090120035A1 (en) * 2007-11-13 2009-05-14 Infinite Edge Technologies, Llc Sealed unit and spacer
US20110104512A1 (en) * 2009-07-14 2011-05-05 Rapp Eric B Stretched strips for spacer and sealed unit
US8967219B2 (en) 2010-06-10 2015-03-03 Guardian Ig, Llc Window spacer applicator
US9228389B2 (en) 2010-12-17 2016-01-05 Guardian Ig, Llc Triple pane window spacer, window assembly and methods for manufacturing same
US9260907B2 (en) 2012-10-22 2016-02-16 Guardian Ig, Llc Triple pane window spacer having a sunken intermediate pane
US9309714B2 (en) 2007-11-13 2016-04-12 Guardian Ig, Llc Rotating spacer applicator for window assembly
US9689196B2 (en) 2012-10-22 2017-06-27 Guardian Ig, Llc Assembly equipment line and method for windows

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2342767A (en) * 1942-02-21 1944-02-29 Westinghouse Electric & Mfg Co Control system
US3036480A (en) * 1957-07-10 1962-05-29 Electron Machine Corp Automatic control of multi-stand rolling mills
US3151508A (en) * 1955-06-23 1964-10-06 United States Steel Corp Apparatus for controlling a continuous rolling mill to maintain constant gage in theleading and trailing ends of strip lengths
US3308644A (en) * 1963-12-02 1967-03-14 Mannesmann Meer Ag Drive for tube reduction mills

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE932663C (de) * 1953-03-04 1955-09-05 Meer Ag Maschf Kontinuierliches Rohr-Reduzierwalzwerk
DE1427926C3 (de) * 1965-12-22 1975-05-22 Kloeckner-Werke Ag, 4100 Duisburg Drehzahlregelung fur die Walzen eines Walzgerüstes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2342767A (en) * 1942-02-21 1944-02-29 Westinghouse Electric & Mfg Co Control system
US3151508A (en) * 1955-06-23 1964-10-06 United States Steel Corp Apparatus for controlling a continuous rolling mill to maintain constant gage in theleading and trailing ends of strip lengths
US3036480A (en) * 1957-07-10 1962-05-29 Electron Machine Corp Automatic control of multi-stand rolling mills
US3308644A (en) * 1963-12-02 1967-03-14 Mannesmann Meer Ag Drive for tube reduction mills

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003229A (en) * 1972-09-06 1977-01-18 Nippon Steel Corporation Method for compensating tail end
US3874211A (en) * 1973-03-02 1975-04-01 Sumitomo Metal Ind Method of controlling the wall thickness within a tube elongater by utilizing a screw down control
US3919872A (en) * 1973-09-24 1975-11-18 Kocks Gmbh Friedrich Methods and apparatus for tube rolling
DE2557707A1 (de) * 1973-09-24 1977-06-30 Kocks Gmbh Friedrich Verfahren und walzwerk zum streckreduzierwalzen von rohren
US4086800A (en) * 1973-09-24 1978-05-02 Friedrich Kocks Gmbh & Co. Process and rolling mill for stretch reduction of tubes
US4033164A (en) * 1974-08-29 1977-07-05 Mannesmannrohren-Werke Ag Method for rolling tubes
US4020667A (en) * 1974-10-23 1977-05-03 Firma Friedrich Kocks Tube rolling
US4002048A (en) * 1975-12-19 1977-01-11 Aetna-Standard Engineering Company Method of stretch reducing of tubular stock
US4306440A (en) * 1979-03-03 1981-12-22 Friedrich Kocks Gmbh & Co. Methods and apparatus for rolling bars, rods and wire
US4430875A (en) * 1980-07-25 1984-02-14 Kocks Technik Gmbh & Co. Rolling mill for the stretch-reducing of tubes
US4567630A (en) * 1981-03-10 1986-02-04 Babcock-Hitachi Kabushiki Kaisha Process of continuously producing plate-shaped catalyst and system therefor
US4599883A (en) * 1985-07-05 1986-07-15 Wean United, Inc. Tandem rolling mill
US20090123694A1 (en) * 2007-11-13 2009-05-14 Infinite Edge Technologies, Llc Material with undulating shape
US9187949B2 (en) 2007-11-13 2015-11-17 Guardian Ig, Llc Spacer joint structure
US20090120035A1 (en) * 2007-11-13 2009-05-14 Infinite Edge Technologies, Llc Sealed unit and spacer
US20090120018A1 (en) * 2007-11-13 2009-05-14 Infinite Edge Technologies, Llc Sealed unit and spacer with stabilized elongate strip
US20090120036A1 (en) * 2007-11-13 2009-05-14 Infinite Edge Technologies, Llc Box spacer with sidewalls
US20090120019A1 (en) * 2007-11-13 2009-05-14 Infinite Edge Technologies, Llc Reinforced window spacer
US8151542B2 (en) 2007-11-13 2012-04-10 Infinite Edge Technologies, Llc Box spacer with sidewalls
US9617781B2 (en) 2007-11-13 2017-04-11 Guardian Ig, Llc Sealed unit and spacer
US8596024B2 (en) 2007-11-13 2013-12-03 Infinite Edge Technologies, Llc Sealed unit and spacer
US8795568B2 (en) 2007-11-13 2014-08-05 Guardian Ig, Llc Method of making a box spacer with sidewalls
US9309714B2 (en) 2007-11-13 2016-04-12 Guardian Ig, Llc Rotating spacer applicator for window assembly
US9127502B2 (en) 2007-11-13 2015-09-08 Guardian Ig, Llc Sealed unit and spacer
US20110104512A1 (en) * 2009-07-14 2011-05-05 Rapp Eric B Stretched strips for spacer and sealed unit
US8586193B2 (en) 2009-07-14 2013-11-19 Infinite Edge Technologies, Llc Stretched strips for spacer and sealed unit
US8967219B2 (en) 2010-06-10 2015-03-03 Guardian Ig, Llc Window spacer applicator
US9228389B2 (en) 2010-12-17 2016-01-05 Guardian Ig, Llc Triple pane window spacer, window assembly and methods for manufacturing same
US9260907B2 (en) 2012-10-22 2016-02-16 Guardian Ig, Llc Triple pane window spacer having a sunken intermediate pane
US9689196B2 (en) 2012-10-22 2017-06-27 Guardian Ig, Llc Assembly equipment line and method for windows

Also Published As

Publication number Publication date
GB1278630A (en) 1972-06-21
DE1927880A1 (de) 1971-04-15
FR2012393B1 (xx) 1974-07-26
DE1752713C2 (de) 1983-09-01
FR2012393A1 (xx) 1970-03-20
DE1927879C2 (de) 1985-07-18
SE375024B (xx) 1975-04-07
DE1752713A1 (de) 1971-08-05
DE1927879A1 (de) 1971-06-16
DE1927880C2 (de) 1985-07-18

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